No background fade when using colour picker
When choosing a colour for a colour card and using the picker the whole Millumin window fades making it impossible to pick a colour of something on the preview window.
This makes matching a specific colour from a video to match a super painful process (usually export a screen cap, open that in preview leave it viewable and then switch back to Millumin and eye dropper the preview window).

Since Millumin V4, you can edit the color-card directly in the layer's properties.
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Simon commented
No this isn't fixed/completed in 5.12r. When I go to change a colour card the whole Millumin UI greys - meaning I still can't colour pick a clip directly in Millumin - easy way to confirm - make a colour card, click to change its colour and try to colour pick a black clip (or no clip) on the canvas - you're matched with grey. All you need to remove is the UI dimming when you open the colour card picker.